newsletter of adriatic Power

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Uninterruptible Power

Does this sound familiar?

http://www.dawn.com/wps/wcm/connect/dawn-content-library/dawn/the-newspaper/editorial/the-power-crisis-930

Check it out. It makes interesting reading..

Here is some basic information about different types of UPS

Line Interactive UPS

These UPS's are similar in design to the Offline or standby UPS except that they have the following additional features:

They have the means to stabilise the output voltage by lowering the voltage when the input is too high and increasing the voltage when the input is too low.
They have an input filter which allows the UPS to clean up the noise generated on the input waveform.
Advantages of this system over an on-line UPS:-

Smaller
More cost effective
Cooler
Quieter
Lighter
Robust
Disadvantages over an on-line UPS:-

Less accurate output voltage
Less accurate ouput frequency
Less able to clean up noise on input waveform
They have a small break in power when switching between voltage levels or between mains and battery backup (inverter)
These units can be designed for long backup times and in sizes up to 20Kva.

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- Service of UPS- free quotation,
- Sales of UPS,
- Sales of AVR- Automatic Voltage Regulator
- Free site analysis/inspection before order,
- Service contracts,
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It is not easy to make power protection interesting, so if you are not that interested, don't hassle, just call us out and we can give you all the advice you require.

Offline/standby
UPS
The offline or standby UPS has only the basic features. The protected equipment is connected directly to the mains power and therefore "sees" the same raw voltage and waveform that the utility produces. At the same time, the UPS charges the battery. There is normally a small transient suppressor that can clamp the voltage above 275 volts. When the incoming mains reaches higher or lower than the designed switchover voltage, the UPS runs from the battery via the built- in inverter. When the mains returns to normal, the Ups switches back to charging the batteries and supplying raw mains to the equipment. Although there is a switching time between mains fail and the inverter switching on, this is tranparent to the user as it is vey fast, typically quicker than 25 milli seconds. These units are available in long runtime applications.

Advantages:

Cost effective
Small
Light
Effeccient
Cool
Disadvantages:-

No filtering of mains waveform, input and output are the same
No stabilising of the input voltage
No stabilising of the frequency
Switching time up to 25mS
These units are ideal where there is no real problem with the quality of the power, but the power does fail from time to time.






Adriatic Power - contact details
Cape Town Gauteng
phone: 021 981 6645 011 824 4470
fax: 021 086 659 2467 011 690 3384
e-mail: shane@adriaticpower.com peter@adriaticpower.com